I have the 789 SI and have the transducer that came with it mounted on the transom and it works great. I added a thru hull transducer and a Y cable so that I can read the bottom at higher speed than I can with the transom mount due to it coming out of the water. With this setup does it mean that the 2D sonar always comes from the thru hull transducer?
Wondering if the system picks between the transom mount and the thru hull via the Y cable.
Also as long as any of the transducers are in the water while moving at any speed then I should be able to get SI, DI and 2D, right?